I. Simkovic et al., PYROLYSIS GAS-CHROMATOGRAPHY MASS-SPECTROMETRY ANALYSIS OF STARCH-BASED ION-EXCHANGERS, Journal of analytical and applied pyrolysis, 43(2), 1997, pp. 145-155
The pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) analysis
of ion-exchangers prepared from starch by crosslinking with epichloro
hydrin (E) in the presence of NaOH and water, with or without NH4OH an
d 3-chloro-2-hydroxypropyltrimethyl-ammonium chloride (CHMAC) was perf
ormed. The data were compared with results run on polymers formed from
E, NH4OH and CHMAC in the absence of starch. The total ion chromatogr
ams showed differences in the composition of degradation products. The
pyrolysis of unmodified starch produced predominantly 2-furaldehyde,
3, 5-dihydroxy-2-methyl-4H-pyran-4-one, 5-hydroxymethylfuraldehyde, 3-
methoxy-5-methyl-2(5H)-furanone, 1,4-dideoxy-D-glycero-hex-1-en-pyrano
se-3-ulose, and levoglucosan. These products were formed to a much low
er extent by pyrolysis of starch derivatives and were not formed from
samples prepared in the absence of starch. However the chemical linkag
e of the poly(hydroxypropyl) matrix to starch or to the quaternary amm
onium groups could not be proved by this method because none of the id
entified products had this type of linkage or indicates the linkage in
analysed material. Only indirect proof of linkage can be concluded fr
om the dramatic decrease of degradation products from starch in the mo
dified starch samples. (C) 1997 Elsevier Science B.V.